# Copyright 2011 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""General utilitiy classes and functions"""

import random
import string


def FetchAll(query):
    """Fetches all model instances matching query.

    Arguments:
      query: db.Query object

    Returns:
      Array of fetched model instances
    """
    offset = 0
    limit = 100
    fetched = []
    results = query.fetch(limit, offset=offset)
    while results:
        fetched += results
        offset += limit
        results = query.fetch(limit, offset=offset)
    return fetched


def GenerateRandomString(length):
    return ''.join(random.choice(string.ascii_lowercase +
                                 string.ascii_uppercase +
                                 string.digits) for x in range(length))
